package com.zy.asrs.utils;

import lombok.Data;
import org.springframework.core.io.Resource;
import org.springframework.core.io.UrlResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

public class FileSaveExampleUtil {


    public static void saveFile(MultipartFile file, String savePath) throws IOException {
        // 创建保存文件的目录（如果不存在）
        File directory = new File(savePath);
        if (!directory.exists()) {
            directory.mkdirs();
        }

        // 保存文件
        String fileName = file.getOriginalFilename();
        String filePath = savePath + fileName;
        File dest = new File(filePath);
        file.transferTo(dest);
    }

    public static void deleteFilesInDirectory(String directoryPath) {
        File directory = new File(directoryPath);
        if (directory.exists() && directory.isDirectory()) {
            File[] files = directory.listFiles();
            if (files != null) {
                for (File file : files) {
                    if (file.isFile()) {
                        file.delete();
                        System.out.println("Deleted file: " + file.getAbsolutePath());
                    }
                }
            }
        }
    }

    public static ResponseEntity<Resource> downloadFile(String filename, HttpServletResponse response) {
        try {
            File file = new File(filename);
            //获取文件的名字再浏览器下载页面
            String name = file.getName();

            // 构建文件路径
            Path filePath = Paths.get(filename);
            Resource resource = new UrlResource(filePath.toUri());

            if (resource.exists()) {
                // 设置响应头
                HttpHeaders headers = new HttpHeaders();
//                headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
                response.setContentType("application/octet-stream");
                headers.setContentDispositionFormData("attachment", filename);
                response.addHeader("Content-Disposition", "attachment;filename=" + new String(name.getBytes(), "UTF-8"));
//                headers.setContentDispositionFormData("attachment", URLEncoder.encode(name, "UTF-8"));
//                response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(name, "UTF-8"));

                // 返回文件响应
                return ResponseEntity.ok()
                        .headers(headers)
                        .body(resource);

//                // 设置响应头
//                HttpHeaders headers = new HttpHeaders();
//                headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
//                headers.setContentDispositionFormData("attachment", URLEncoder.encode(name, "UTF-8"));
//                response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(name, "UTF-8"));
//
//                // 返回文件响应
//                return ResponseEntity.ok()
//                        .headers(headers)
//                        .body(resource);
            } else {
                response.setStatus(HttpServletResponse.SC_NOT_FOUND);
                return null;
            }
        } catch (IOException e) {
            e.printStackTrace();
            response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            return null;
        }
    }

    public static List<FileDTO> viewFileList(String directoryPath) {
        List<FileDTO> fileList = new ArrayList<>();

        File directory = new File(directoryPath);
        if (directory.exists() && directory.isDirectory()) {
            File[] files = directory.listFiles();
            if (files != null) {
                for (File file : files) {
                    if (file.isFile()) {
                        FileDTO fileDTO = new FileDTO(file.getName(), file.length(), file.getAbsolutePath());
//                        FileDTO fileDTO = new FileDTO(file.getName(), file.length());
                        fileList.add(fileDTO);
                    }
                }
            }
        }

        return fileList;
    }

    @Data
    public static class FileDTO {
        private String name;
        private long size;
        private String path;
        private String userName;
        private boolean success;
        private String errorMessage;

        public FileDTO(String name, long size, String path) {
            this.name = name;
            this.size = size;
            this.path = path;
        }

        public FileDTO(String name, long size, String path,String userName) {
            this.name = name;
            this.size = size;
            this.path = path;
            this.userName = userName;
        }

        public FileDTO(String name, long size) {
            this.name = name;
            this.size = size;
        }

        public FileDTO(boolean success, String name, String errorMessage) {
            this.success = success;
            this.name = name;
            this.errorMessage = errorMessage;
        }

    }

}